gecko-dev/widget/cocoa/nsMacCursor.mm

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2012-05-21 15:12:37 +04:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsMacCursor.h"
#include "nsObjCExceptions.h"
#include "nsDebug.h"
#include "nsDirectoryServiceDefs.h"
#include "nsCOMPtr.h"
#include "nsIFile.h"
#include "nsString.h"
/*! @category nsMacCursor (PrivateMethods)
@abstract Private methods internal to the nsMacCursor class.
@discussion <code>nsMacCursor</code> is effectively an abstract class. It does not define complete
behaviour in and of itself, the subclasses defined in this file provide the useful implementations.
*/
@interface nsMacCursor (PrivateMethods)
/*! @method getNextCursorFrame
@abstract get the index of the next cursor frame to display.
@discussion Increments and returns the frame counter of an animated cursor.
@result The index of the next frame to display in the cursor animation
*/
- (int) getNextCursorFrame;
/*! @method numFrames
@abstract Query the number of frames in this cursor's animation.
@discussion Returns the number of frames in this cursor's animation. Static cursors return 1.
*/
- (int) numFrames;
/*! @method createTimer
@abstract Create a Timer to use to animate the cursor.
@discussion Creates an instance of <code>NSTimer</code> which is used to drive the cursor animation.
This method should only be called for cursors that are animated.
*/
- (void) createTimer;
/*! @method destroyTimer
@abstract Destroy any timer instance associated with this cursor.
@discussion Invalidates and releases any <code>NSTimer</code> instance associated with this cursor.
*/
- (void) destroyTimer;
/*! @method destroyTimer
@abstract Destroy any timer instance associated with this cursor.
@discussion Invalidates and releases any <code>NSTimer</code> instance associated with this cursor.
*/
/*! @method advanceAnimatedCursor:
@abstract Method called by animation timer to perform animation.
@discussion Called by an animated cursor's associated timer to advance the animation to the next frame.
Determines which frame should occur next and sets the cursor to that frame.
@param aTimer the timer causing the animation
*/
- (void) advanceAnimatedCursor: (NSTimer *) aTimer;
/*! @method setFrame:
@abstract Sets the current cursor, using an index to determine which frame in the animation to display.
@discussion Sets the current cursor. The frame index determines which frame is shown if the cursor is animated.
Frames and numbered from <code>0</code> to <code>-[nsMacCursor numFrames] - 1</code>. A static cursor
has a single frame, numbered 0.
@param aFrameIndex the index indicating which frame from the animation to display
*/
- (void) setFrame: (int) aFrameIndex;
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@end
/*! @class nsCocoaCursor
@abstract Implementation of <code>nsMacCursor</code> that uses Cocoa <code>NSCursor</code> instances.
@discussion Displays a static or animated cursor, using Cocoa <code>NSCursor</code> instances. These can be either
built-in <code>NSCursor</code> instances, or custom <code>NSCursor</code>s created from images.
When more than one <code>NSCursor</code> is provided, the cursor will use these as animation frames.
*/
@interface nsCocoaCursor : nsMacCursor
{
@private
NSArray *mFrames;
NSCursor *mLastSetCocoaCursor;
}
/*! @method initWithFrames:
@abstract Create an animated cursor by specifying the frames to use for the animation.
@discussion Creates a cursor that will animate by cycling through the given frames. Each element of the array
must be an instance of <code>NSCursor</code>
@param aCursorFrames an array of <code>NSCursor</code>, representing the frames of an animated cursor, in the
order they should be played.
@param aType the corresponding <code>nsCursor</code> constant
@result an instance of <code>nsCocoaCursor</code> that will animate the given cursor frames
*/
- (id) initWithFrames: (NSArray *) aCursorFrames type: (nsCursor) aType;
/*! @method initWithCursor:
@abstract Create a cursor by specifying a Cocoa <code>NSCursor</code>.
@discussion Creates a cursor representing the given Cocoa built-in cursor.
@param aCursor the <code>NSCursor</code> to use
@param aType the corresponding <code>nsCursor</code> constant
@result an instance of <code>nsCocoaCursor</code> representing the given <code>NSCursor</code>
*/
- (id) initWithCursor: (NSCursor *) aCursor type: (nsCursor) aType;
/*! @method initWithImageNamed:hotSpot:
@abstract Create a cursor by specifying the name of an image resource to use for the cursor and a hotspot.
@discussion Creates a cursor by loading the named image using the <code>+[NSImage imageNamed:]</code> method.
<p>The image must be compatible with any restrictions laid down by <code>NSCursor</code>. These vary
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by operating system version.</p>
<p>The hotspot precisely determines the point where the user clicks when using the cursor.</p>
@param aCursor the name of the image to use for the cursor
@param aPoint the point within the cursor to use as the hotspot
@param aType the corresponding <code>nsCursor</code> constant
@result an instance of <code>nsCocoaCursor</code> that uses the given image and hotspot
*/
- (id) initWithImageNamed: (NSString *) aCursorImage hotSpot: (NSPoint) aPoint type: (nsCursor) aType;
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@end
@implementation nsMacCursor
+ (nsMacCursor *) cursorWithCursor: (NSCursor *) aCursor type: (nsCursor) aType
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
return [[[nsCocoaCursor alloc] initWithCursor:aCursor type:aType] autorelease];
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
+ (nsMacCursor *) cursorWithImageNamed: (NSString *) aCursorImage hotSpot: (NSPoint) aPoint type: (nsCursor) aType
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
return [[[nsCocoaCursor alloc] initWithImageNamed:aCursorImage hotSpot:aPoint type:aType] autorelease];
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
+ (nsMacCursor *) cursorWithFrames: (NSArray *) aCursorFrames type: (nsCursor) aType
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
return [[[nsCocoaCursor alloc] initWithFrames:aCursorFrames type:aType] autorelease];
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
+ (NSCursor *) cocoaCursorWithImageNamed: (NSString *) imageName hotSpot: (NSPoint) aPoint
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
nsCOMPtr<nsIFile> resDir;
nsAutoCString resPath;
NSString* pathToImage, *pathToHiDpiImage;
NSImage* cursorImage, *hiDpiCursorImage;
nsresult rv = NS_GetSpecialDirectory(NS_GRE_DIR, getter_AddRefs(resDir));
if (NS_FAILED(rv))
goto INIT_FAILURE;
resDir->AppendNative(NS_LITERAL_CSTRING("res"));
resDir->AppendNative(NS_LITERAL_CSTRING("cursors"));
rv = resDir->GetNativePath(resPath);
if (NS_FAILED(rv))
goto INIT_FAILURE;
pathToImage = [NSString stringWithUTF8String:(const char*)resPath.get()];
if (!pathToImage)
goto INIT_FAILURE;
pathToImage = [pathToImage stringByAppendingPathComponent:imageName];
pathToHiDpiImage = [pathToImage stringByAppendingString:@"@2x"];
// Add same extension to both image paths.
pathToImage = [pathToImage stringByAppendingPathExtension:@"png"];
pathToHiDpiImage = [pathToHiDpiImage stringByAppendingPathExtension:@"png"];
cursorImage = [[[NSImage alloc] initWithContentsOfFile:pathToImage] autorelease];
if (!cursorImage)
goto INIT_FAILURE;
// Note 1: There are a few different ways to get a hidpi image via
// initWithContentsOfFile. We let the OS handle this here: when the
// file basename ends in "@2x", it will be displayed at native resolution
// instead of being pixel-doubled. See bug 784909 comment 7 for alternates ways.
//
// Note 2: The OS is picky, and will ignore the hidpi representation
// unless it is exactly twice the size of the lowdpi image.
hiDpiCursorImage = [[[NSImage alloc] initWithContentsOfFile:pathToHiDpiImage] autorelease];
if (hiDpiCursorImage) {
NSImageRep *imageRep = [[hiDpiCursorImage representations] objectAtIndex:0];
[cursorImage addRepresentation: imageRep];
}
return [[[NSCursor alloc] initWithImage:cursorImage hotSpot:aPoint] autorelease];
INIT_FAILURE:
NS_WARNING("Problem getting path to cursor image file!");
[self release];
return nil;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (BOOL) isSet
{
// implemented by subclasses
return NO;
}
- (void) set
{
if ([self isAnimated]) {
[self createTimer];
}
// if the cursor isn't animated or the timer creation fails for any reason...
if (!mTimer) {
[self setFrame:0];
}
}
- (void) unset
{
[self destroyTimer];
}
- (BOOL) isAnimated
{
return [self numFrames] > 1;
}
- (int) numFrames
{
// subclasses need to override this to support animation
return 1;
}
- (int) getNextCursorFrame
{
mFrameCounter = (mFrameCounter + 1) % [self numFrames];
return mFrameCounter;
}
- (void) createTimer
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
if (!mTimer) {
mTimer = [[NSTimer scheduledTimerWithTimeInterval:0.25
target:self
selector:@selector(advanceAnimatedCursor:)
userInfo:nil
repeats:YES] retain];
}
NS_OBJC_END_TRY_ABORT_BLOCK;
}
- (void) destroyTimer
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
if (mTimer) {
[mTimer invalidate];
[mTimer release];
mTimer = nil;
}
NS_OBJC_END_TRY_ABORT_BLOCK;
}
- (void) advanceAnimatedCursor: (NSTimer *) aTimer
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
if ([aTimer isValid]) {
[self setFrame:[self getNextCursorFrame]];
}
NS_OBJC_END_TRY_ABORT_BLOCK;
}
- (void) setFrame: (int) aFrameIndex
{
// subclasses need to do something useful here
}
- (nsCursor) type {
return mType;
}
- (void) dealloc
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
[self destroyTimer];
[super dealloc];
NS_OBJC_END_TRY_ABORT_BLOCK;
}
@end
@implementation nsCocoaCursor
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- (id) initWithFrames: (NSArray *) aCursorFrames type: (nsCursor) aType
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
self = [super init];
NSEnumerator *it = [aCursorFrames objectEnumerator];
NSObject *frame = nil;
while ((frame = [it nextObject])) {
NS_ASSERTION([frame isKindOfClass:[NSCursor class]], "Invalid argument: All frames must be of type NSCursor");
}
mFrames = [aCursorFrames retain];
mFrameCounter = 0;
mType = aType;
return self;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (id) initWithCursor: (NSCursor *) aCursor type: (nsCursor) aType
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
NSArray *frame = [NSArray arrayWithObjects:aCursor, nil];
return [self initWithFrames:frame type:aType];
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (id) initWithImageNamed: (NSString *) aCursorImage hotSpot: (NSPoint) aPoint type: (nsCursor) aType
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
return [self initWithCursor:[nsMacCursor cocoaCursorWithImageNamed:aCursorImage hotSpot:aPoint] type:aType];
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (BOOL) isSet
{
return [NSCursor currentCursor] == mLastSetCocoaCursor;
}
- (void) setFrame: (int) aFrameIndex
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
NSCursor* newCursor = [mFrames objectAtIndex:aFrameIndex];
[newCursor set];
mLastSetCocoaCursor = newCursor;
NS_OBJC_END_TRY_ABORT_BLOCK;
}
- (int) numFrames
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
return [mFrames count];
NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(0);
}
- (NSString *) description
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
return [mFrames description];
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (void) dealloc
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
[mFrames release];
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[super dealloc];
NS_OBJC_END_TRY_ABORT_BLOCK;
}
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@end